Why is there a waiting time to top up?

I don’t understand why you have to wait to top up… If the chips are free why not constantly give 500 away?

Keep more player log in daily.
Chips inflation plays a big part. if all the time top up, the chips value decrase quick, no-one buy chips, aka the site wont run on thin air, then crash, then no site at all.
(the chips not really free… it is but not, long storry short, nothing free)